<template>
  <el-dialog
    :title="title"
    :visible.sync="uploadShow"
    @close="$emit('close', false)"
    width="70%"
  >
    <!-- 进度条 -->
    <el-steps :active="active" align-center>
      <el-step title="下载、导入" description="下载模板,导入文件"> </el-step>
      <el-step
        title="预览、上传"
        description="本地预览数据、上传数据"
      ></el-step>
    </el-steps>
    <!-- 内容区域 -->
    <div class="view-box">
      <!-- 步骤1 -->
      <div class="box" v-show="active == 0">
        <div class="step-box1">
          <div>
            <el-button type="success" size="small" @click="downloadTmpFile"
              >下载模板</el-button
            >
            <span>{{ fileInfo.name }}</span>
          </div>
          <div>
            <input type="file" hidden @change="importExcelFile" ref="file" />
            <el-button type="warning" size="small" @click="$refs.file.click()"
              >导入excel</el-button
            >
            <span>{{ fileName || "文件大小不要超过50kb" }} </span>
          </div>
        </div>
        <div class="tc">
          <el-button type="primary" size="small" @click="nextA"
            >下一步</el-button
          >
        </div>
      </div>
      <!-- 步骤2 -->
      <div v-show="active == 1">
        <el-alert
          title="请核查数据是否有无，有可删除该条数据！"
          type="warning"
          center
          effect="light"
          show-icon
        ></el-alert>
        <br />
        <el-table :data="tableList" border max-height="450" stripe>
          <el-table-column
            :fixed="key === 0"
            :label="names"
            v-for="(names, key) in keyName"
            width="140px"
            :key="key"
          >
            <template slot-scope="scope">
              {{ tableList[scope.$index][names] }}
            </template>
          </el-table-column>
          <el-table-column label="操作" fixed="right">
            <template slot-scope="scope">
              <el-button
                type="danger"
                icon="el-icon-delete"
                circle
                size="small"
                @click="delRow(scope)"
              ></el-button>
            </template>
          </el-table-column>
        </el-table>
        <br />
        <!-- 按钮区 -->
        <div class="tc">
          <el-button type="warning" size="small" @click="active--"
            >上一步</el-button
          >
          <el-button
            type="primary"
            size="small"
            @click="$emit('uploadData', tableList)"
            >上传数据</el-button
          >
        </div>
      </div>
    </div>
  </el-dialog>
</template>

<script>
import * as XLSX from "xlsx";
export default {
  props: {
    // 模板信息
    fileInfo: {
      type: Object,
      require: true,
      default() {
        return { name: "", url: "" };
      },
    },
    // 批量导入标题
    title: {
      type: String,
      default: "批量导入",
    },
    // 是否打开
    uploadShow: {
      type: Boolean,
      default: false,
    },
  },
  model: {
    prop: "uploadShow",
    event: "close",
  },
  data() {
    return {
      active: 0,
      fileName: "",
      keyName: [], // 键名
      tableList: [], // 表格数据
    };
  },
  methods: {
    // 点击下载模板
    downloadTmpFile() {
      const elink = document.createElement("a");
      elink.download = this.fileInfo.name;
      elink.style.display = "none";
      elink.href = this.fileInfo.url;
      document.body.appendChild(elink);
      elink.click();
      document.body.removeChild(elink);
    },
    // 导入excel文件
    importExcelFile() {
      console.log(this.$refs.file.files[0]);
      const excelFileInfo = this.$refs.file.files[0];
      const type = [
        "application/vnd.ms-excel",
        "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
      ];
      if (!type.includes(excelFileInfo.type))
        return this.$message.warning("格式不正确,仅支持xls和xlsx后缀");
      if (excelFileInfo.size / 1024 > 50)
        return this.$message.warning("文件太大,文件大小不要超过50kb");
      this.fileName = excelFileInfo.name;
      // 解析文件
      const fileReader = new FileReader();
      fileReader.onload = (event) => {
        try {
          const data = event.target.result;
          const workbook = XLSX.read(data, { type: "binary" }); //  以字符编码的方式解析
          const wsname = workbook.SheetNames[0]; // 取第一张表
          const ws = XLSX.utils.sheet_to_json(workbook.Sheets[wsname]); // 生成json表格内容
          console.log(ws);
          // 赋值表头数据
          const obj = ws[0]; // 读取第一个数据
          for (const key in obj) {
            this.keyName.push(key); // 把json键名加入表头数组
          }
          // 赋值表格数据
          this.tableList = ws;
        } catch (e) {
          console.log(e);
          return this.$message.warning("解析文件出错");
        }
      };
      fileReader.readAsBinaryString(excelFileInfo);

      // 释放内容
      this.$refs.file.value = "";
    },
    // 删除这一行数据
    delRow(scope) {
      this.tableList.splice(scope.$index, 1);
    },
    // 下一步A
    nextA() {
      if (!this.fileName) return this.$message.warning("请导入文件");
      this.active++;
    },
  },
};
</script>
<style lang="scss">
.view-box {
  margin: 20px;
  // border:1px solid #eee;
  // box-shadow: 0 0 3px 0 rgba(0,0,0,.1);
}
.tc {
  text-align: center;
}
.step-box1 {
  align-items: center;
  display: flex;
  justify-content: space-around;
  margin: 20px;
  padding: 20px;
}
.step-box1 span {
  margin-left: 10px;
}
</style>
